Molar-chisel.



No. 805,888. PATENTED NOV. 21, 1905.

H. M. STEVENSON.

MOLAR CHISEL.

APPLICATION FILED FEB. 23,1905.

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I I ahtozvwm s UNITED STATES PATENT OFFICE.

MOLAR- Specification of Letters Patent.

CHISEL.

Patented Nov. 21, 1905.

Application filed February 23g 1905- erial No. 246,970.

To all whom it may concern.-

Be it known that I, HENRY M. STEVENSON, a citizen of the United States, residing at Perry, in the county of Dallas and State of Iowa, have invented certain new and useful Improvements in Molar-Chisels, of which the following is a specification.

This invention provides a veterinary instrument designed most particularly to enable the removal of teeth when broken off, thereby obviating the usual practice of trephining and punching, which is trying both to the animal and operator and is attended with more or less dangerous results.

The instrument consists, essentially, of an approximately U-shaped frame provided at the extremity of one of its members with a chisel or bit of suitable form, according to the special nature of the work, for either separating the gum and alveolar process from the tooth to admit of its extraction as a whole or for breaking up the tooth to facilitate its removal in pieces, the other member adapted to receive the blow of a mallet or like tool.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and accompanying drawings.

While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment thereof is shown in the accompanying drawings, in Which Figure 1 is a perspective view of a molarchisel embodying the invention, showing its manner of operation. Fig. 2 is a side view of the instrument, its end portions being in section. Fig. 3 is an edge View of the instrument.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The molar chisel or instrument comprises a frameA of approximately U form, the members being tapered toward their outer ends and widened toward their inner or connected ends to provide a substantial structure for transmitting the blow to the cutter, chisel, or bit. The yoked end of the instrument is made concave in its sides for lightness and to present a neat appearance, thereby enabling the necessary amount of metal being disposed in the width or plane of the frame, so as to transmit the force of the blow when the instrument is in operation. The frame is preferably constructed of metal and may be formed in any manner found most advantageous.

A chisel or hit 1 is provided at or near the extremity of one of the members of the frame and is preferably detachably connected thereto to admit of its substitution by a cutter of different form to meet varying conditions. The bit projects outward from its supporting member and is arranged, preferably, in the plane of the frame. An opening 2 is formed in the end portion of the member to receive the bit or cutter, and any suitable means may be employed for positively holding the bit in place, so as to prevent its loss or dropping into the mouth. As shown, a catch 3 is pivotally connected at one end to the member and is adapted to engage with a notch or groove 4 in a side of the bit or cutter at its projecting end. In order to increase the range of usefulness of the instrument, each member is provided, near its outer extremity, with an opening 2, so that the cutter or hit may be attached to either member, as may be desired.

In the event of a tooth, such as a molar, becoming broken off close to the gum and it is required to extract the root one member of the instrument is thrust into the mouth of the animal, about as indicated in Fig. 1, and if the tooth has to be extracted as an entirety the bit or cutter l is placed against the side of the tooth and the projecting end of the opposite member is struck by means of a mallet or like tool, thereby forcing the cutter down alongside of the tooth between it and the gum and alveolar process. This operation is. repeated until the tooth is completely loosened in the maxilla, after which it may be readily removed by the forceps in the accustomed way or may be pried from the maxilla in the usual way. Should it be required to break up the tooth to admit of its removal in pieces, the cutter or hit is placed upon the same in such a position so that a smart blow upon the projecting member of the frame will splinter or fracture the tooth, so that the portions may be easily removed by the forceps.

The instrument may be advantageously used upon either upper or the lower set of teeth and is of special advantage when it it required to extract any one of the molars. In order that the members or arms of the frame may be of a minimum length and the bits or cutters applied to advantage, the frame is deflected intermediate of its ends, as indicated most clearly in Fig. 3.

Having thus described the invention, what is claimed as new isl. A molar-chisel comprising an approximately U-shaped frame, one member or arm thereof being provided with a cutter or bit, substantially as set forth.

2. A molar-chisel comprising an approximately U-shaped frame deflected in the direction of its length and having one of its members provided With a bit or cutter.

3. Amolar-chisel comprising a frame of ap- HENRY M. STEVENSON. [a s] Witnesses:

ALBERT L. BROWN, FRED. G. HAMLIN. 

